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Packing Fraction and Efficiency

Coordination ...

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Coordination number in 3D hexagonal close packing is

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Q. The coordination number of metal crystallising in a hexagonal close packing is:

Q. What is the coordination number of hexagonal close packing (hcp) lattice?

Q. The coordination number of a metal crystallizing in a hexagonal close-packed structure is

Q. The coordination number of a metal crystallizing in a hexagonal close packed structure is

[NCERT 1978; IIT 1999]

Q. Match the types of packing given in column I with the items given in column II.

	Column I		Column II
(i)	Square close packing in two dimension	(p)	Triangular voids
(ii)	Hexagonal close packing in two dimensions	(q)	Pattern of spheres is repeated in every fourth layer
(iii)	Hexagonal close packing in three dimension	(r)	Coordination number=4
(iv)	Cubic close packing in three dimension	(s)	Pattern of spheres is repeated in alternate layers

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